Thermoplastic composition of polyester, polyamide and glycidyl-modified polyolefin

Abstract

A thermoplastic resin composition comprises (A) a polyester resin, (B) a polyamide resin, (C) a modified polyolefin containing glycidyl-bearing structural units in an amount of 10-4 to 10-2 eq/g in terms of epoxy equivalent and (D) a quaternary phosphonium salt or a quaternary ammonium salt.

What is claimed is: 
     
       1. A thermoplastic resin composition which comprises (A) a polyester resin, (B) a polyamide resin, (C) a modified polyolefin containing glycidyl units shown by the formula (IA) in an amount of 10 -4  to 10 -2  eq/g in terms of epoxy equivalent: ##STR10## wherein R 1  is H or methyl, and (D) a quaternary phosphonium salt having the formula (II) or a quaternary ammonium salt having the formula (III): ##STR11## wherein R 1  -R 4  are independently each a hydrocarbyl group and X is a halogen atom, the weight ratio of the component (A) to the component (B) being from 30:70 to 70:30, the component (C) being contained in an amount of 1 to 50 parts by weight per 100 parts by weight of the sum in total of the components (A) and (B), the component (D) being contained in an amount of 0.01 to 0.1 part by weight per 100 parts by weight of the component (A). 
     
     
       2. A thermoplastic resin composition which consists essentially of (A) a polyester resin, (B) a polyamide resin, (C) a modified polyolefin containing glycidyl units shown by the formula (IA) in an amount of 10 -4  to 10 -2  eq/g in terms of epoxy equivalent: ##STR12## wherein R 1  is H or methyl, and (D) a quaternary phosphonium salt having the formula (II) or a quaternary ammonium salt having the formula (III): ##STR13## wherein R 1  -R 4  are independently each a hydrocarbyl group and X is a halogen atom, the weight ratio of the component (A) to the component (B) being from 30:70 to 70:30, the component (C) being contained in an amount of 1 to 50 parts by weight per 100 parts by weight of the sum in total of the components (A) and (B), the component (D) being contained in an amount of 0.01 to 0.1 part by weight per 100 parts by weight of the component (A). 
     
     
       3. The composition as claimed in claim 1, wherein the polyolefin moiety of (C) is selected from among polyethylene, polypropylene, poly(1-butene), poly(1-pentene), polyisobutene, copolymers of two or more of the monomers constituting the polyolefins or a blend of two or more of the polyolefins. 
     
     
       4. The composition as claimed in claim 1, wherein R 1  in formula (IA) is H. 
     
     
       5. The composition as claimed in claim 2, wherein R 1  in formula (IA) is H. 
     
     
       6. The composition as claimed in claim 1, wherein the polyester resin (A) is polybutylene terephthalate. 
     
     
       7. The composition as claimed in claim 1, wherein the polyamide rein (B) is nylon 66. 
     
     
       8. The composition as claimed in claim 1 wherein the quaternary phosphonium salt of (D) is  CH 3  (CH 2 ) 3  ! 4  PBr or (C 6  H 5 ) 4  PBr. 
     
     
       9. The composition as claimed in claim 1, wherein the quaternary ammonium salt of (D) is  CH 3  (CH 2 ) 3  ! 4  NI. 
     
     
       10. The composition as claimed in claim 1, wherein R 1 , R 2 , R 3  and R 4  of the formulae (II) and (III) each are an alkyl or an aryl. 
     
     
       11. The composition as claimed in claim 1, wherein (A) has a mole ratio of carboxyl to hydroxy of 30:70 to 100:0. 
     
     
       12. The composition as claimed in claim 1, wherein R 1 , R 2 , R 3  and R 4  of the formulae (II) and (III) each are an alkyl having 4 to 10 carbon atoms or phenyl and the halogen is bromine or iodine. 
     
     
       13. The composition as claimed in claim 1, wherein the polyolefin is an ethylene-propylene copolymer, the polyamide resin (B) is nylon 66, the polyester resin (A) is polybutylene terephthalate and (D) is tetrabutylphosphonium bromide. 
     
     
       14. The composition as claimed in claim 1, which is obtained by drying (A) and (B) and blending, kneading and injecting or extruding (A), (B), (C) and (D).